<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <button id="btn1">按钮</button>
  <script>
    function show() {
      console.log(this);
    }
    show()

    var person = {
      name: "coderwhy",
      show: function () {
        console.log(this.name);
      }
    }
    person.show()

    var btn = document.getElementById("btn1")
    btn.onclick = function () {
      console.log(this.innerHTML);
    }
  </script>
</body>

</html>